Telescopic coupling tube for a vacuum cleaner

ABSTRACT

A telescopic coupling tube for a vacuum cleaner includes a mounting tube, a connecting sleeve, a sealing sleeve, a telescopic tube, a locking assembly, and a positioning cap. The connecting sleeve is provided for the insertion of the telescopic tube. A guide slot and toothed engaging holes are formed in the telescopic tube. Based upon the interaction of the above-mentioned components, an easy adjustment of the assembly length is achieved.

BACKGROUND OF THE INVENTION

1. Fields of the Invention

The invention relates to a telescopic coupling tube for a vacuumcleaner, and more particularly, to a structure that ensures an easyadjustment of the assembly length, thereby meeting the use requirements.

2. Description of the Related Art

The conventional vacuum cleaner (not shown) normally includes aplurality of extension tubes and different kinds of suction heads thatare engaged into the rear end surface of the body of the vacuum cleaner.In this way, they can be employed in accordance with user requirements.The plug-type connection belongs to the prior art so that no furtherdescriptions thereto are given hereinafter. The invention relates to adust absorption head for a vacuum cleaner.

As well-known in the art, the conventional extension coupling tube for avacuum cleaner has a fixed length. It's not possible for furtherextension if required. In other words, the user has no other way forextension even when the length is not sufficient. As a result, thisstructure requires further improvements.

SUMMARY OF THE INVENTION

A primary object of the invention is to provide a telescopic couplingtube for a vacuum cleaner that improves the conventional extension tubeand allows a more easy and convenient use of the vacuum cleaner.

According to the invention, a mounting tube and a telescopic tube areattached together. Moreover, a locking assembly is employed for an easyadjustment of the assembly length of the mounting tube and thetelescopic tube. In this way, the use requirement is fulfilled withoutaffecting the original storage effect.

BRIEF DESCRIPTION OF THE DRAWINGS

The accomplishment of this and other objects of the invention willbecome apparent from the following description and its accompanyingdrawings of which:

FIG. 1 is an exploded perspective view of a telescopic coupling tube fora vacuum cleaner in accordance with the invention;

FIG. 2 is a perspective assembly view of a telescopic coupling tube fora vacuum cleaner in accordance with the invention;

FIG. 3 is a schematic drawing of the telescopic coupling tube in partialcutaway view; and

FIG. 4 is a partial sectional view side of the invention, showing theoperation way thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIGS. 1 and 2, a telescopic coupling tube for a vacuumcleaner in accordance with the invention includes a mounting tube 10, aconnecting sleeve 20, a sealing sleeve 30, a telescopic tube 40, alocking assembly 50, and a positioning cap 60.

The mounting tube 10 has a mounting portion 11 at one end thereof forattaching to an inserting part of accessories of a vacuum cleaner (notshown) and an insertion portion 12 at the other end thereof. A slot 13is formed in the second insertion portion 12.

The connecting sleeve 20 is mounted on the insertion portion 12 of themounting tube 10. The connecting sleeve 20 includes an opening 21corresponding to the slot 13 of the insertion portion 12.

The sealing sleeve 30 fits into an internal hole 14 of the insertionportion 12 of the mounting tube 10. The sealing sleeve 30 is providedwith a locking portion 31 facing to the slot 13 of the mounting tube 10for the connection to the locking assembly 50. The locking portion 31includes a locking slot 32 at both sides thereof. The locking assembly50 includes a push knob 51 with an engaging hook 54 that fits into thelocking slot 32 in place. Two projections 33 are positioned near thecenter of the sealing sleeve 30. The locking assembly 50 includes anengaging element 52 with positioning holes 55 into which the projections33 fit in place. Moreover, a notch 34 is disposed at the side portion ofthe projections 33.

The positioning cap 60 is plugged into one end of the telescopic tube40. A mounting portion 41 is positioned at the other end thereof forattaching to an inserting part of accessories of a vacuum cleaner (notshown). A guide slot 42 is axially formed at the end surface of thelocking assembly 50. One side of the guide slot 42 is provided withtoothed engaging holes 43.

The locking assembly 50 includes a push knob 51, an engaging element 52,and an elastic element 53. An engaging hook 54 is positioned at bothsides of the internal surface of the push knob 51. Meanwhile, a push lug56 is disposed at a certain position of the locking assembly 50. Theengaging element 52 is substantially curved and includes positioningholes 55 at both sides thereof. A push piece 57 is positioned near thecenter of the engaging element 52. A push surface 571 is disposed at oneside of the push piece 57 while an engaging cambered surface 572 ispositioned at the other side thereof. The engaging cambered surface 572of the push piece 57 is extended downward to pass through the notch 34of the sealing sleeve 30 and then to engage into the engaging hole 43 ofthe guide slot 42 of the telescopic tube 40. Moreover, the elasticelement 53 is supported against a portion between the push lug 56 of thepush knob 51 and the locking portion 31 of the sealing sleeve 30.

The positioning cap 60 is plugged into and positioned within an internalhole 44 at one side of the telescopic tube 40.

Based upon the assembly of the above-mentioned components, as shown inFIGS. 3 and 4, the elastic element 53 normally applies a force actingbackward such that the push knob 51 is constantly compressed in a pushedposition. At that time, the push lug 56 is just pushed against the pushsurface 571 of the push piece 57 of the engaging element 52 while theengaging cambered surface 572 at the other end of the push piece 57 isengaged into one of the toothed engaging hole 43 of the guide slot 42 ofthe telescopic tube 40, thereby creating an engaging effect. When thepush knob 51 is pushed, the push lug 56 is free from the contact withthe push piece 57 of the engaging element 52 such that the engagingelement 52 is returned to the original bent position. In this way, theengaging cambered surface 572 of the push piece 57 is released from thetoothed engaging hole 43 of the guide slot 42 of the telescopic tube 40.In other words, the user only requires to slightly push the push knob 51for adjusting the telescopic tube 40 to a required length. Thereafter,the push knob 51 is released. Thus, the assembly length can be adjustedas required.

The guide slot 42 of the telescopic tube 40 has a certain length. Thepush piece 57 of the engaging element 52 is constantly extended into theguide slot 42. Therefore, an automatic limit of the telescopic travel isensured when the telescopic travel reaches the end stop at both sides ofthe guide slot 42.

Many changes and modifications in the above-described embodiment of theinvention can, of course, be carried out without departing from thescope thereof. Accordingly, to promote the progress in science and theuseful arts, the invention is disclosed and is intended to be limitedonly by the scope of the appended claim.

1. A telescopic coupling tube for a vacuum cleaner, comprising: a) amounting tube having a mounting portion at one end thereof for attachingto an inserting part of accessories of a vacuum cleaner and an insertionportion at the other end thereof, a slot being formed in the secondinsertion portion; b) a connecting sleeve mounted on the insertionportion of the mounting tube, the connecting sleeve having openingcorresponding to the slot of the insertion portion; c) a sealing sleevefitting into an internal hole of the mounting tube, the sealing sleeveis provided with a locking portion facing to the slot of the mountingtube, the locking portion having a locking slot at both sides thereof,two projections being positioned near the center of the sealing sleeve,a notch being disposed at the side portion of the projections; d) atelescopic tube having one end into which a positioning cap is plugged,a mounting portion being positioned at the other end thereof forattaching to an inserting part of accessories of a vacuum cleaner, aguide slot being axially formed at the end surface of a lockingassembly, one side of the guide slot being provided with toothedengaging holes; e) a locking assembly having a push knob, an engagingelement, and an elastic element, an engaging hook being positioned atboth sides of the internal surface of the push knob, a push lug beingdisposed at a certain position of the locking assembly, the engagingelement being substantially curved and having positioning holes at bothsides thereof, a push piece being positioned near the center of theengaging element, a push surface being disposed at one side of the pushpiece while an engaging cambered surface is positioned at the other sidethereof, the engaging cambered surface of the push piece being extendeddownward to pass through the notch of the sealing sleeve and then toengage into the engaging hole of the guide slot of the telescopic tube,the elastic element being supported against a portion between the pushlug of the push knob and the locking portion of the sealing sleeve; andf) a positioning cap plugged into and positioned within an internal holeat one side of the telescopic tube, whereby the elastic element normallyapplies a force acting backward such that the push knob is constantlycompressed in a pushed position; at that time, the push lug is justpushed against the push surface of the push piece of the engagingelement while the engaging cambered surface at the other end of the pushpiece is engaged into one of the toothed engaging hole of the guide slotof the telescopic tube, thereby creating an engaging effect, wherein,when the push knob is pushed, the push lug is free from the contact withthe push piece of the engaging element such that the engaging element isreturned to the original bent position; as a result, the engagingcambered surface of the push piece is released from the toothed engaginghole of the guide slot of the telescopic tube.